Removing partner leaves a single-person family

[BertKoor]

Example of a family consisting of only partners (not yet parents)
https://dev.webtrees.net/demo-dev/tree/demo/family/f62/Lord-Charles-Bentinck-Anne-Wellesley
From the menu Edit - Change Family Members.
Remove either person from the family. The family itself still exists afterwards.

In the 1.x branch of webtrees it would also remove the family, since a family of a single person does not serve a purpose.
In the 2.x branch of webtrees it does not remove the family.

Can we have old behaviour back, or is there a rationale I'm missing?

[fisharebest]

The rationale was #4497

Family records are only deleted if they contain no significant facts.

The logic used is:

webtrees/app/Http/RequestHandlers/DeleteRecord.php

Lines 76 to 81 in 50b8938

	// If we have removed a link from a family to an individual, and it now has only one member and no genealogy facts
	if (
	$linker instanceof Family &&
	preg_match('/\n1 (ANUL|CENS|DIV|DIVF|ENGA|MAR[BCLRS]|RESI|EVEN)/', $new_gedcom, $match) !== 1 &&
	preg_match_all('/\n1 (HUSB|WIFE|CHIL) @(' . Gedcom::REGEX_XREF . ')@/', $new_gedcom, $match) === 1
	) {